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Wavefront coding imaging system with adjustable phase mask

A technology of phase mask and wavefront encoding, which is applied in the field of optics, can solve the problem of unavoidable impact on the restored image quality, and achieve the effect of strong flexibility

Pending Publication Date: 2018-11-06
XIDIAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, noise amplification in the process of image restoration has an inevitable impact on the quality of the restored image

Method used

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  • Wavefront coding imaging system with adjustable phase mask
  • Wavefront coding imaging system with adjustable phase mask
  • Wavefront coding imaging system with adjustable phase mask

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Embodiment Construction

[0076] The invention proposes a wavefront coding imaging system with adjustable phase mask.

[0077] refer to figure 1 , the system includes an imaging lens 2, a phase mask assembly 3, an image detector 4, and an image processing unit 5 arranged sequentially along the transmission direction of the optical axis;

[0078] The phase mask assembly is formed by superimposing two cubic phase plates along the transmission direction of the optical axis, and the two cubic phase plates can form relative rotation angles in two ways;

[0079] Method 1: One cubic phase plate is fixed, and the other cubic phase plate rotates around the optical axis;

[0080] Method 2: Both cubic phase plates rotate around the optical axis, and the rotation positions of the two cubic phase plates are different; (the relative rotation angle of the two cubic phase plates can be driven by a motor to rotate one of the cubic phase plates, and the other fixed, and can also be driven by a differential device);

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Abstract

The invention belongs to the technical field of optics, specifically to a wavefront coding imaging system with an adjustable phase mask. The system can switch a phase mask form according to actual needs, thereby allowing flexible switching among conventional mask-free imaging, coding imaging and more mask coding forms, and allowing higher flexibility of the wavefront coding imaging system. The system includes an imaging lens, a phase mask assembly, an image detector and an image processing unit arranged in sequence in an optical axis transmission direction. The improvements are that the phasemask assembly is formed by superposing two cubic phase plates in the optical axis transmission direction, and the two cubic phase plates can form a relative rotation angle by adopting two modes.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to a wavefront encoding imaging system with an adjustable phase mask. Background technique [0002] The depth of field of extended optical systems has always been a hotspot in academic research. Since the mid-1980s, although various methods have been proposed for depth of field expansion, it was not until Dr. Dowski and Professor Cathey of the University of Colorado in the United States proposed the wavefront in 1995. After the concept of coding, the extension of depth of field had a real breakthrough. [0003] Taking the one-dimensional optical system as an example, its defocus optical transfer function OTF can be obtained through the autocorrelation operation of the generalized pupil function, as follows: [0004] [0005] Among them, u and x are the normalized spatial frequency and the transverse coordinates of the aperture plane, respectively; W 20 is the maxim...

Claims

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Application Information

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IPC IPC(8): G02B27/00G02B26/06
CPCG02B26/06G02B27/00
Inventor 魏静萱赵惠夏晶晶张凌
Owner XIDIAN UNIV